Abstract
A photoelectric signal, output by a photoelectric receiver, may detrimentally change after the photoelectric encoder is used for a period of time or when the environment changes; this will directly affect the accuracy of the encoder and lead to fatal errors in the encoder. To maintain its high accuracy, we propose an encoder that can work in a variety of environments and that adopts full digital processing. A signal current that travels from the receiver of a photoelectric encoder is converted into a voltage signal via current limiting resistance. All signals are directly processed in the data processor component of the system. The encoder converts all the signals into its normalized counterpart. Then, the angle of the encoder is calculated using the normalized value. The calculated encoder angle compensates for any error. The final encoder angle is obtained, and the encoder angle is output accordingly. Experiments show that this method can greatly reduce the encoder’s volume. This method also reduces the encoder error from 167 arcseconds to 53 arcseconds. The encoder can still maintain a high accuracy during environmental changes, especially in harsh environments where there are higher accuracy requirements.
Highlights
A photoelectric encoder is a high-precision angle-measuring device that is widely used in various aviation, aerospace, and ground measurement systems [1,2,3]
When an external environment changes, or the encoder is used for a long period, the parameters of the light-emitting element and the receiving element change [4,5,6,7], resulting in a deviation between the current output from the receiving element of the encoder and the ideal current, which affects the accuracy of the encoder [8,9,10]
Any encoder error caused by environmental changes can be reduced, to a certain extent, by using complementary light-emitting and receiving elements at high and low temperatures [11,12]
Summary
A photoelectric encoder is a high-precision angle-measuring device that is widely used in various aviation, aerospace, and ground measurement systems [1,2,3]. By adjusting the resistance value of the digital potentiometer, the output amplitude of the encoder signal is within an ideal range. This method can reduce the encoder errors caused by changes in the signal amplitude. This kind of processing circuit is complex and requires high-precision digital potentiometers. By adjusting the resistance of potentiometer and the amplification of the amplifier, the amplitude value of SIN is just the input range of the AD converter, and the amplitude value of the same COS is consistent with the input range of the AD converter In this system, traditional amplifiers are removed. This method can reduce the encoder’s dependence on installation and adjustment accuracy, which is suitable for mass-produced encoders
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